Sewing machine



J. D. K-ARLE SEWING MACHINE `May 2s,I 1940.

3 Sheets-Sheet 1 Filed Mrch 25, 1939 May 28, 1940. J. D. KARVL'E SEWING MACHINE Filed March 25, 1939 3 Sheets-Sheet 2 J. D. KARLE SEWING MACHINE May 28, 1940.

3 Sheets-Sheet 3 Filed March 25, 1959 Patented May 28, 1940. y

UNITED STATES PATENT OFFICE azoassc v lSEWING MACHINE 'John D. Karle, Roselle Park, N. J., assignor to -The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application March 25, 1939, Serial No. 264,093 1': Claims. (ci. 11a- 181) 'I'his invention relates to sewing machines and cured-to one of its ends and a crank I6 secured more particularly to the stitch-forming instrumentalitesof sewing machines.

One of the objects of this invention is the provision of an improved rotary hook which will rotate at a uniform angular velocity, and only 11/2 times for each stitch-forming cycle, thereby effecting a 25% reduction in the speed of the hook and its actuating mechanism over the usual 2 to 1 type of hook. This decrease in speed rel duces heating of and wear on the bobbin-case flange and the raceway of the hook.

Other objects of this invention are the provision of a balanced hook which may be operated at high speeds without vibration and an improved thread-deilector and pull-01T 4element which has an cas-action on the thread and will more effectively deflect the thread' and at the same time pull a supply of thread from the scription and accompanying drawings in which:

Fig. 1 is a side elevation of a sewing machine having my invention embodied therein.

iig. 2 is a bottom plan view of the machine showing the mechanism below the bed-plate.

IFig. 3 is an end elevation of the machine with the face-plate removed.

' Figs. 4 and 5 are perspective views showing the hook and the thread-deflector, the threaddeector beingshown in active and inactive position.

Fig. 6 is a face view of the hook.

Figs. f7 and 8 are side views of the hook. ,v 'Fig 9 is aside elevation of the hook and bobbin-case, thehook being shown in section.

Fig. 10 is a disassembled perspective'view of the hook.

' In the embodiment of this invention selected for illustration, I0 represents the bed-plate of the machine which carries the 'standard I I having an overhanging bracket-arm I2 which terminates in a hollow head. |3. (Journaled in suitable bearings in the bracket-arm I2 is an actu- 'ating shaft I4 having a balance-wheel Ii seto its other end.

Journaled in the bearings carried by the hollow head I3 is a needle-bar I8 carrying a needle I9. The needle-bar I 8 is reciprocated in Aits bearings by means of the link 20 which has one of its ends connected to the crank I6 andV its other end operatively connected to the. pivotpln 2| which is secured to the needle-bar I8. Also carried by the hollow head is a presser-bar 22 carrying a presser-foot 23 which is urged downwardly by the spring 24. Also located within the hollow head is the take-up 26 which is actuated by means of the crank i6.

The shaft I4 carries a feed-lift eccentric 28 which actuates a pitman 29 having its lower end connected to a feed-lift rock-shaft 30 for the purpose of imparting a rising and falling movement' to the feed-bar 3|. Y A feed-advance eccentric 32 is also carried by the shaft I4 and this eccentric actuates a yoked lever 33 which has its lower end connected to a rock-shaft 34 for the purpose of imparting a feed and return movement to the feed-dog 3|. The forward and return feeding movement imparted to the feedbar 3| maybe adjusted by varying the pivot point vupon which the lever 33 moves. It will be understood that the feed-bar 3| carries a. feed-dog 38 which cooperates with vthe presserfoot 23 to advance the material through the machine. For a more detailed description of the above described mechanism reference maybe had to the patent to Diehl et al., No. 1,146,406,

dated July 13, 1915.

Carried by the shaft I4 is 'a gear 31 which meshes with a gear 38 carried by a vertical shaft 39 which is iournaled in suitable bearings in the machine. Carried by the lower end of the shaft 39 is a gear 40 which meshes with the gear 4| secured to one end of a hook-shaft `42.. The ratio of the gears 31, 38 is as 1 is to 1 and therefore the shaft 39 makes one complete rotation for each rotation of the shaft I4, and the ratio of the gears 40, 4| is as 11/2 is-to 1 and therefore the hook-shaft 42 makes 11/2 rotations for each rotation of the vertical shaft '39 and the actuating shaft |4.

Fixed to the end of the shaft 42 byl the set V screws 44 is a hook indicated generally as a, a (Fig. 10), which cooperates with the needle I9.

Assuming that the needle through the material and the usual needle-aperapart and are formed with a loop-seizing beak\ 46' and 41' and a loop-controlling tail 46a and 47a, respectively. VThe members 46 and 47 are identical inV size, shape and weight and each-f member is formed with a raceway'50 in which is journaled the peripheral bearing rib 5l of the stationary bobbin-case carrier-element 52. The bearing rib 5i of the bobbin-case carrier has the `usual gap in its upper portion to provide a loopdetaining shoulder 53 (Fig. 9). The bobbincase carrier 52 is formed with a rotation restraining notch 54 loosely entered by the tongue 55 of the rotation restraining bar 56 mounted on the under side of the bed I0. Removably held in the bobbin-case carrier-element 52 is the bobbin-case element 57 which carries the bobbin 51' of under thread. It is understood that the bobbin-case which carries the under or lower thread mass includes the two separable elements 52 and 51. A

Fixed to the end of the vertical shaft 39 is a crank 58 which is operatively connected to one end of the reciprocatory shaft 59 by a link 50. The shaft 59 is journaled 'in the bearings 6i carried by the depending lugs 62 of the bedv i0 and secured by the split hub 63 to the shaft 59 is an arcuate member 6B carrying a thread-deector and pull-oft` device 65 which acts on the needle and bobbin-thread during each stitch-forming cycle.

A trough-shaped guard 68 is detachably secured to the bearing lugs 62, and the end of the guard beneath the standard is adapted to contain a lubricant, a cover ES'being provided to prevent the lubricant from escaping. v

The operation of the machine is as follows: I9 has descended ture in the throat-plate 66 to its lowest position and has begun its ascending motion, the stitchforming instrumentalities will then be in the position shown in Figure 4. At this point in the stitch-forming cycle the beak '46' of the rotating hook enters or seizes the needle-loop thrown out by the needle and expands the needle-loop for the purpose of casting ity around the lower thread mass or bobbin in the usual maner. After the loop has been seized and the needle has ascended to a point above the thread-deector and pull-oir element 65, this element, through the!- operative connections above described, is moved laterally to engage the needle-thread N and the under thread U, and after the hook has traveled substantially 180 the thrad-deecting and pull-ofi' element 65 has moved to the position shown in Fig. 5. In this position the element 65 has pulled a length of under thread from the bobbin and all of the threads have been deected out of the path of movement of the hook-beak 41', so that the beak 41' may pass the threads without seizing them.

`When the hook reaches cast-off position, the

crank operated take-up 26 begins itsquick upstroke and draws the needle-loop off of thel hookbeak 46' and onto the loop-controlling tail I1a. As rotation of the hook continues the needleloop is released by the controlling tail 41a and the take-up 26 sets the stitch.

While the stitch is being set the hook is given a rotary movement of substantially or 1/ a revolution. It Will be understood that the present hookmakes -11/2 revolutions for each rotation of the needle-bar shaft or in other words for needle is out of the work and `during stitch setting and feeding the thread-denector and pull-off 65 is moved, through its connections with the shaft 39, back to the position shown in Fig. 4. It will be apparent from the foregoing description that the shaft 39 makes 'one ,rotation foreach rotation of the needle-bar shaft and, therefore, the element 65 is vibrated in timed relation with the needle and once for each needle reciprocation.

After the stitch is set the needle again descends through the work and during the early part of its ascending movement throws out a loop and in this stitch-forming cycle the beak 5l' seizes `the loop and casts it around the lower thread-mass. The stitch-forming action is identical with that above described.

From the foregoing it will be understood that the hook is provided with two loop-seizing beaks which are identical in shape and are disposed 180 apart, and the hook is given 11/2 rotations for each needle reciprocation so that alternate needie-loops areA seized by different beaks, 'This construction results in a balanced hook and a reduction in speed over the usual 2 to 1 hook of 25%, with its attendant advantages.

It will also be understood that the thread-defiector and pull-off 65 is moved laterally of the hook, or parallel to the axis about which the hook rotates, once for each stitch-forming cycle and this element functions -to pull off a length of thread from the bobbin and deiiects all of the threads to prevent them from being seized by the idle hook-beak. It will be apparent that the thread-defiecting andv pull-oil' device may be used 'with a loop-taker having only one loop-seizing material.

From the foregoing description considered in connectipn with the accompanying drawings, the construction, manner of operation and several l advantages of my improved sewing machine will be clearly and fully understoodf It is apparent that s uch a machine has a wide variety of uses, and it will be understood that the form, construction and arrangement of the several elementsy employed may be varied. Therefore, the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of the appended claims.

Having thus set forth the nature of the invention what I claim herein is:

1. In combination with a reciprocatory eyepointed needle, a rotary hook cooperating therewith and having a plurality of `loop-seizing beaks, and meansfor imparting to said hook more than one complete rotation for -each reciprocation of the needle.

2. In combination with a reciprocatory eyepointed needle, a rotary hook cooperating with said needle and having two loop-seizing beaks, and means for rotating said hook ll/z'times for each needle reciprocation.

3. In combination .with a reciprocatory eyepointed needle, a circularly moving loop-taker cooperating therewith and having two loop-seizing beaks disposed vsubstantially 180 apart, and

means for rotating said loop-taker 1% times for means for imparting to said loop-taker more than one complete rotation for each needle reciprocation.

5. A stitch-forming mechanism for sewing machines comprising an eye-pointed thread-carrying needle, means for reciprocating said needle, a rotary loop-taker cooperating with said needle and having two beaks which are adapted to alternately seize the needle-loop, and means for rotating said loop-taker 11/2 times for each needle reciprocation.

6. A sewing machine having, in combination, a neede-bar carrying an eye-pointed needle, means for reciprocating said needle-bar, a hook cooperating with saidneedle, said hook being provided with a plurality of loop-seizing beaks, and means for actuating said hook so that different loopseizing beaks seize the needle-loop during successive stitch-forming cycles.

7. A sewing machine having, in combination, a reciprocatory needle, means for reciprocating said needle,7a hook cooperating with said needle, a thread-dellector, and means for vibrating said thread-deflector laterally of the hook.

8. A sewing machine having, in combination, an eye-pointed thread-carrying needle, means for resiprocating said needle, a rotary hook cooperating with said needle, means for imparting to said hook more than one complete rotation for each needle reciprocation, a thread-defiector and means for vibrating said thread-deflector laterally of the hook during each stitch-forming cycle.

9. A sewing machine having, in combination, an eye-pointed thread-carrying needle, means for reciprocating said needle, a rotary hook cooperating with said needle and' having a plurality oi.' loop-seizing beaks, means for imparting to said hook more than one complete rotation for each needle reciprocation so that a dierent loop-seizing beak seizes a needle-loop during sucessive l stitch-forming cycles, a thread-deflector and means for vibrating said thread-deflector laterally of the hook during each stitch-forming cycle.

10. A sewing machine having, in combination, an eye-pointed thread-carrying needle, means for reciprocating said needle, a rotary hook coduring each stitch-forming cycle, a member adapted to engage the needle-thread and bobbincase thread and means for moving said member laterally of the line of seam formation during each stitch-forming cycle.

12. A sewing machine having, in combination, an eye-pointed thread-carrying needle, a shaft for reciprocating said needle, a rotary hook cooperating with said needle in the formation of stitches, a shaft for actuating said hook, means for operatively connecting the needle-bar actuating shaft and the hook actuating shaft so that the hook actuating shaft makes more than one complete rotation for each needle reciprocation, a thread-deilector overlying said hook and means operatively connected to the needle-bar actuating shaft for actuating said thread-defiector laterally of the hook during each stitch-forming cycle'.

13. A sewing machine having, in combination, a reciprocatory eye-pointed needle, a needle-bar shaft for actuating said needle, a rotary hook cooperating with said needle in the formation of stitches, a shaft for actuating said hook, means for operatively connecting said hook-shaftwith said needle-bar shaft so that thehook-shaft is given more than one rotation for each rotation of the needle-bar shaft,'a shaft located adjacent said hook-shaft, a thread-defiector carried by said shaft and overlying said hook and means connecting said thread-deilector shaft with the needle-bar actuating shaft whereby the threaddeiiector is actuated once for each stitch-forming cycle.

14. A rotary hook for sewing machines comprising, a body, two members carried by said body and disposed 180 apart, each of said members being formed with a loop-seizing beak and a raceway, and a bobbin-case carrier journaled in the raceways.

15. A rotary hook for sewing machines comprising, a body, a plurality of members carried by said body and detachably secured thereto, each of said members being formed with a loop-seizing beak JOHN D. mmm. 

